* {
    margin: 0px;
    padding: 0px;
    font-family: Arial, Helvetica, sans-serif;
    /* 内减盒子 */
    box-sizing: border-box;
}

body{
    font-size: 12px;
}

li {
    list-style: none;
}

img{
    vertical-align: middle;/* 图片居中 */
}

a {
    color: #000;
    /* 取消a标签默认下划线 */
    text-decoration: none;
}

input {
    border: 0 none;
    outline-style: none; /*取消内边框*/
}

.fl {
    float: left;
}
.fr {
    float: right;
}

/* 清除浮动，解决margin-top塌陷 */
.clearfix:after {
    content: "";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}

.clearfix {
    zoom: 1;
}